北師大版數(shù)學(xué)復(fù)習(xí)專題3：二元一次方程(組)

專題07二元一次方程（組）知識點.21xyab42xy2ab3與b）．1D1ab21xyab42xyab42ab3與選．12大，）xy50xy50xy50xy50xy180xy180xy90xy90．．．．1．a(chǎn)b52ab10ab（）520155201511C．．．a(chǎn)b50a2b3ab52ab102ab10試題分析：∵，∴，解得：，則ba（3）1．32xy）xy52xy52xy20xy203x2y202x3y202x3y523x2y52．．．．．xy203x2y52xy．三xy）23y300x3y300xx3y300xy033000xy3000xy300為奇數(shù)x為奇數(shù)A．B．C．3y300x0x3000y300、為奇數(shù)．．5人或64321）．5x6y，663則5253562．2mxny8nxmy1xy12mn7（）22B．．2．2mxny8nxmy12mn82nm1m3n2xy1﹣3n．2x3yk,x2y1yk是．．1yx22x2y5xy2y2．54．5212）5454=．a(chǎn)xby2b，則．．a(chǎn)b54ab6，．4”52258”xy．5x2y102x5y8．2xy3xynmn2與42mnm．．4m2mn2xy3xy2mn2n2mn242mn與mn．211．xyzxyz21010x:15y:12z2:1:1120xy40z50．5b．3426116B5臺A1臺B6臺A3臺BBB進AA元，B）．AxByAxByx30)y4076x426(x30)y40)120y56；ABAaB，A3447xy3x4y145(43)x(74)y90xy，15xy25．7．，．，xy106080300xx6040y15y400．．322xym2xy2y4yx，m8．x2y33x5ym2xy0y，m．xy0mymx2y3x2m113x5ym2y7mxy0y，．2314Pnn(nP?(2)nbP與nb9a和b．P2y33x2y102x3y102xy4x2xy3x2y4①；xy；1x2x4xy1y2y4xy12）33x2y252x3y25x5y5．xyyxx與y1x2x4xy1y2y4；xyxy；103x2y252x3y25x5y5．）55度度3100AAwAwA380452524．11xy20x40y152020x20y440xy40xy18．12為為2壇．為為2x4y18x18y13，1x2y3．1325①xy4x11y②整即③14xy1把1．32①xy9x4y19②；3247①xy222x8y36②22y．x24y211x2y3x54y2））．，3xy2把；23(x4y)472xyx4y22223（2i=23x24y2；14(x2y)x4y4xy或，x24y222211x2y54x2y2xy則==．x7y54y1y）123．xyx3）xxxyxyyy．．．．．xy60①x2y30②xy．．x1x2,3mxny6y1y2n）．242D4．mn6①x1x2,2mn6②y1y2mxny6+，15即．．3678D．9．x21y239（）．838x21y2x與y﹣．x21y2986.3分）如圖，過A）1633．33．x3y2．7x4y①5x6y②×2x3y2為．2xy4①2y15x②6．x1y2．x1y2．（88174輛.xy..=1184xy1y5）x1y2x2y3x2y1x2y1．2y7y3．19x2y1．3xy7①2xy②+．x2y1．1BA地BAB樹86AB束時開始AB9A地植樹B．AxByxy86Am20BAB9xmym8:設(shè)AxByxy86AmBAB9xmym8．:2312．16．5y14x22BAx3x5y1y4試而B1ab求．A2Bab1,211ab．:ABABAB9．12圖1圖2盒x22x）?aaa．時時．當(dāng)時時．臺A23臺B臺A臺BABBA2AxyyxABAAAB）臺A臺B臺A臺B13當(dāng)y隨xy臺A型臺B13Ay隨xy臺A臺B24．毛=]325(1a231a21a；2y3x3x5ym2my）31．a(chǎn)mym1aa1(aa2(aaa1212==a；3=31；當(dāng)2y3x2m